When you ask Dr. Andy Walker, one of the foremost experts on rootstock, why we need rootstock at all, his answer is initially simple: “Blame it all on phylloxera.” Of course, it’s more complicated than that. In the early 1990s, that scourge led to the massive replanting of grapevines on phylloxera-resistant rootstock. That’s also when grape growers began to gradually recognize the importance of rootstock selection in determining the future success of their vineyards. An...

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